android - java.lang.NoSuchMethodError：Lcom/google/firebase/FirebaseApp 类中没有虚拟方法 zzbqo()Z；或其超类

Question

java.lang.NoSuchMethodError：Lcom/google/firebase/FirebaseApp 类中没有虚拟方法 zzbqo()Z；或其超类（“com.google.firebase.FirebaseApp”的声明出现在 /data/app/woolamania.in.woolamania-2/base.apk 中）在 com.google.firebase.database.FirebaseDatabase.getInstance（未知来源) 在 com.google.firebase.database.FirebaseDatabase.getInstance(Unknown Source) 在woolamania.in.woolamania.Home.onCreate(Home.java:32) 在 android.app.Activity.performCreate(Activity.java:6093)

Home.java 类的代码是-

公共类 Home 扩展 AppCompatActivity 实现 View.OnClickListener{

TextView points;
Button freeRoll,lottery;
DatabaseReference mdatabase;


@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_home);
    Firebase.setAndroidContext(this);
    mdatabase= FirebaseDatabase.getInstance().getReference("User");
    Query query= mdatabase
            .orderByChild("email")
            .equalTo("[e-mail]");

    query.addListenerForSingleValueEvent(new ValueEventListener() {

        @Override


        public void onDataChange(DataSnapshot dataSnapshot) {

            if(!dataSnapshot.exists()){
                Toast.makeText(getApplicationContext(),"in first if and dsnap dont exist",Toast.LENGTH_SHORT).show();
            }


             for(DataSnapshot singleSnapshot: dataSnapshot.getChildren()){

                if(singleSnapshot.exists()){
                    Toast.makeText(getApplicationContext(),"already exists",Toast.LENGTH_SHORT).show();
                }

             }
        }

        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

标签： android

Answer 1

请确保您已在依赖项中编写了此内容：

dependencies {
  // ...
  implementation 'com.google.firebase:firebase-core:16.0.4'
  // for real-time database
  implementation com.google.firebase:firebase-database:16.0.3
}